Thermodynamic Properties and Phase Transitions of Multiferroics (1-x)BiFeO3-xPbFe0.5Nb0.5O3
Kallaev S. N. 1, Omarov Z. M. 1, Bilalov A. R.1, Pavlenko A. V.2
1Amirkhanov Institute of Physics, Daghestan Federal Research Center, Russian Academy of Sciences, Makhachkala, Russia
2Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
Email: kallaev-s@mail.ru

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Studies of the heat capacity and dielectric properties of (1-x)BiFeO3-xPbFe0.5Nb0.5O3 ceramic multiferroics in the temperature range of 300-800 K were carried out. Based on studies of the temperature and concentration dependences of the heat capacity and dielectric constant, the phase transition temperatures of the (1-x)BiFeO3 system were determined. (1-x)PbFe0.5Nb0.5O3 with various x concentrations. It is shown that with an increase in the PbFe0.5Nb0.5O3 component, the temperatures of the ferroelectric and antiferromagnetic transitions in BiFeO3 shift to low temperatures. Taking into account structural studies, a "temperature-concentration" phase diagram has been constructed. Keywords: heat capacity, dielectric properties, ferromagnet, antiferromagnet, multiferroics.
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